ServiceWorker polyfill Fetch implementation.

Source/modules/serviceworkers/polyfills/cachePolyfill.js

Index: Source/modules/serviceworkers/polyfills/cachePolyfill.js
diff --git a/Source/modules/serviceworkers/polyfills/cachePolyfill.js b/Source/modules/serviceworkers/polyfills/cachePolyfill.js
index 30c145279c4523c5724931a430c36a965a4fc9c7..7fb2dd596c07a11d8fe876785fd95502321adbdf 100644
--- a/Source/modules/serviceworkers/polyfills/cachePolyfill.js
+++ b/Source/modules/serviceworkers/polyfills/cachePolyfill.js
@@ -82,9 +82,14 @@ var Cache = (function () {
     };
 
     Cache.prototype.add = function(request) {
-        // FIXME: Implement this.
+        var scope = this;
+        request = _castToRequest(request);

[jsbell, 2014/06/05 17:48:02]

_castToRequest isn't exposed, and you probably want the fetch() impl to do this
anyway?

[jsbell, 2014/06/05 17:50:50]

Ah, sorry, I didn't see that there was a local copy of this in this polyfill.

         return new Promise(function (resolve, reject) {
-            reject("Cache.add not implemented.");
+            Fetch(request).then(
+                function(response) {
+                    scope.set(request, response).then(resolve);
+                },
+                reject);
         });
     };